Vapor-engine.



HEINRICH HILDEBRAND, HANS HIL-DEBRAND & FRITZ HIL'DEBRAND VAPOR ENGINE.

APPLIOATION FILED JULY 14, 1910 Q} Patented Jan. 2, 1912.

, with? HEINRICH HILDEBRAND, HANS HILDEBRAND, AND

GERMANY.

FRITZ HILDEIBRAND, 0F BERLIN.

VAPOR-ENG-IN E.

Specification of Letters Patent.

Patented Jan. 2, 11912.

Application filed July 14, 1910. Serial No. 571,9205.

mixed with compressed or heated atmospheric air. The hot air prevents freezing of the inner parts of the engine. In order, however, to be able to condense the motive fluid of the exhaust again, it is requisite to expel the contained atmospheric air, so that a special gas separating device must be combined with the apparatus forreliquefying the carbonic 'acid.

According to the present invention the provision of a gas separator is rendered redundant by mixture of the liquefied gas, or its vapor, with the compressed or heated absolute (2'. e. gaseous) gas of the same agent; thus for instance liquid carbonic acid with heated absolute carbonic acid gas, liquid air with heated absolute air. The heating of the absolute as (for example carbonic acid) can be efibcted by any desirable source of heat, such for instance as by compression in the engine itself. The engine may work in a two or a four stroke c cle.

In the accompanying drawing the figure is a vertical section and part elevation of one form of plant, with a four stroke cycle engine, according to the present invention.

The engine takes so much carbonic acid vapor from a heating vessel 1) that it is con; verted by compression in the working-cylinder a into absolute carbonic acid gas of high temperature. The extent of compression can be regulated through the quantity of vapor to be let in, and the heat of compression arising can be utilized to heat the liquid carbonic acid, admitted, for instance, at the point of maximum compression. The vaporouscarbonic acid from the vessel 0 flows through the dome d and pipe 0, while the liquid carbonic acid passes into the cylinder a through the pipe 0 and positively actuated nozzle-valve f. The ikewise mechanically operated suction-valve g regulates the supply of carbonic acid vapor to the cylinder. The vessel Z) may, for example, be constructed in the manner of a Inultitubular steam boiler; Water at the natural temperature flows through the pipe it into the fore-chamber c and thence through the tubes is into the end-chamber Z and leaves the vessel through the exit m at a temperature which .is considerably lower I than that 'at which it entered the vessel, since its heat has been imparted to the liquid carbonic acid contained in the latter. Through the reduction of the pressure in the engine cylinder a, in the vessel 6, and the heat of compression of the self-generated gas, the liquid car-;

bonic acid evaporates and mingles with the hot absolute gases. The exhaust stroke drives the expanded motive agent through the valve a into the condenser 0, expanison and cooling it returns into the liquid state, dropping through the reducing valve 17 into-the collecting-chamber r. A feed pump .9 draws the liquid-through the valve t and forces it through the valve a, pipe 1), and a dome to back into the vessel b whereby the'circuit is completed and the procedure cancommence anew. If the temperatures are low, the absolute gas can be where by further generated by adiabatic compression of the.

vapor of the liquefied gas. The vapor may either be sucked in, or flow in through its own pressure, or may be forced into the working cylinder by a compressor. An engine working with a two stroke cycle takes the absolute gas from a reservoir or a compressor; and the liquid entering the work ing cylinder of the engine mingles wit-h it at the moment of reversal of the working piston in its backmost position. The exhaust period can, however, be so arranged that so much of the motive agent remains in the engine that it is converted into an absolute gas by compression by the piston, whereon it mingles with the liquid or the wet vapor thereof.

Having thus described our invention, we declare that what we claim as new and desire to secure by Letters Patent isi 1. The method of working a vapor engine by means of gases of low boiling points, consisting in mingling in the engine cylinder relatively to the pressure.

liquefied gas or its vapor, before expansion, with heated absolute gas of the same agent,

Substantially as described.

with the absolute gas of the same agent, said absolute gas being generated by adiabatic 15 compression of vapor of the liquefied gas, substantially as described.

In testimony whereof We aflix our signatures in presence of two witnesses.

HEINRICH HILDEBRAND. HANS HILDEBRAND. FRITZ HILDEBRAND.

Witnesses HENRY HASPER, WOLDEMAR HAUPT. 

